B
The solar system has many parts. The Sun is in the center. Eight planets go around it.
4. ______
Earth is one of the eight planets.
5. ______ Five planets have more than one moon. The moons go around the planets.
6. ______ There are thousands of asteroids in the solar system. Asteroids go around the sun.
Comets (彗星) are balls of ice.
7. ______ Comets have tails (尾巴) when they're near the sun.
Shooting stars are bits of rocks or iron (铁) that fall towards Earth. Shooting star is another name of meteor.
The Sun, Planets, asteroids, comets and shooting stars make up the wonderful solar system.
8. ______ However, it is only a small part of the universe.
阅读短文，从方框内所列选项中选出最佳选项填入对应空白处，使短文通顺、连贯。
A. The sun is quite hot.
B. Asteroids are big rocks.
C. They go around the sun, too.
D. It has one moon going around.
E. The solar system is a great BIG family!
F. They get heat and light from the sun.